An adaptive plasmonic lens

Apr 9, 2015 not categories

” Nature highlights a recent ACS Photonics study on a novel reconfigurable lens” 

In constant search for miniaturizing commercial optical devices, integrated micro-optical elements play a central role in the development of applications that aim to improve high-density data storage and imaging. Until now, such devices presented the drawback of fine aligning and adjusting the focus through mechanically operations, therefore, limiting their accuracy, size and speed.

Now, in the recent study “Fast and Transparent Adaptive Lens Based on Plasmonic Heating” published by the Plasmon nano-optics research group, led by ICREA Prof. at ICFO Romain Quidant, researchers have been able to develop a novel concept in which they have been able to transform a conventional optical lens into an effective lens, called the Adaptive Photo-Thermal or APT lens, whose image focal plane can be shaped and controlled by an optical signal. The results have been published in ACS Photonics and highlighted by Nature.

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Such effective lens is capable of dynamically changing its focal plane thanks to its temperature dependence of the refractive index of matter. By covering the surface of a glass coverslip with a pattern of plasmonic nanostructures, these create the desired temperature on the lens when shined with resonant illumination. A 100micron chamber filled with water acts as the index-changing thermo-optical medium and, thus, a local increase of temperature induces a gradient of refractive index that affects the propagation of optical rays.


The results obtained from this study show promising developments in the optical engineering field, especially for future integrated optical devices. Applications that could profit from this discovery include 3D microscopy and photography.



Publication Date (Web) of this paper: January 29, 2015

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